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6) Sound amplified from aircraft Some have suggested that the sound was due to inversion - a phenomenon that occurs when a layer of warm air sits over a layer of cooler air, magnifying the sound of an aircraft miles away.

7) Aliens Some conspiracy theorists claim that the mysterious booms are noises created by aliens - although there is no evidence to support this.

The day after the boom in Alabama, a similar noise was heard in Idaho.

Multiple people reported hearing a loud boom over the Lewiston-Clarkston Valley around .

The boom, nicknamed 'Bama Boom', has left experts stumped, with suggested causes ranging from supersonic aircrafts to meteors exploding in the atmosphere.Many of the reports described the sound as being similar to a sonic boom, although its cause and location remain unclear.Cairns, October 10 Cause: Unknown, suggested explanations include a meteorite, a gas bottle explosion or military plane On October 10, a boom was heart over Cairns, Queensland that had the city baffled.Footage showed a bright light in the sky over Inari in Finland - but the flash was so intense it was also seen in Russia's Kola Peninsula and in northern Norway.Stargazers reported seeing the sky 'light up like day' for a few seconds alongside a loud noise as the space rock plummeted towards Earth.